They make dandy plinking targets for your .22, or even a good air rifle.
Good square hit, and instant gratification.

Oh yeah!

I've done that.

Once, just for the heck of it, I took a pick ax to the can. It
sprayed over everything including a slightly worn white shirt. Being
on the cheap side, I continued to wear the shirt as if nothing happened.
Only one person ever asked my how my shirt got that yellow, THICK
stain. I was quite honest.